RU2799215C1 - Method for manufacturing composite reinforcing products - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention relates to the manufacture of reinforcing products for concrete structures. For the manufacture of reinforcing products, a fibre rope is formed, pulled through a bath with a binder in the form of a sulphur melt with a temperature of 130-150°C, an excess amount of the melt is squeezed out in a forming die and cooled. In the manufacture of straight products, the rope is cooled to shop temperature and twisted into coils. In the manufacture of broken-shaped products, the rope after the forming die is rapidly cooled in a refrigerating chamber with water at a temperature of 5 to 12°C to a plastic state, and broken-shaped products are moulded.

EFFECT: simplification of the technology for manufacturing composite reinforcing products of various shapes with a simultaneous increase in its strength characteristics.

2 cl

Description

The invention relates to the field of construction, and specifically to the manufacture of reinforcing products for concrete structures.

A known method of manufacturing composite polymer reinforcement using pultrusion technology (Kazakov I.A. Development of technology for continuous molding of axisymmetric composite products by pultrusion, pp. 22-24, Moscow, RCTU named after D.I. Mendeleev, 2016). In a known method, tows of glass or basalt fiber are impregnated in a bath with a polymer binder at a shop temperature, then combined into a single bundle, which is pulled through a hot spinneret, then through a tunnel heat chamber, where the binder is polymerized with a gradual increase in temperature to 260 ° C, then hardened a straight rod is gradually cooled in a bath of water and twisted into a bay or sawn into measured segments. According to a known method, rods are produced with a rectilinear arrangement of fibers, which leads to longitudinal delamination and tensile failure. According to the method, rectilinear rods are produced; it is impossible to obtain curvilinear and broken-shaped elements. The method is quite energy intensive.

A known method for producing sulfur concrete by mixing a melt of technical sulfur with inert aggregates. When cooled below 120 ° C, sulfur turns into a durable material, binds sand and crushed stone into a monolith (Usov B.A. “Technology and application of sulfur concrete”, System Technologies, No. 4 (17), pp. 56-69, Makhachkala, Institute system technologies, 2015). The disadvantage of the sulfur concrete obtained in a known way is brittleness.

A known method of plasticizing sulfur by rapid cooling of the melt in water (Sangalov Yu.A., Karchevsky S.G., Ionov V.I. Plasticization of sulfur. Physical and chemical aspects. Bashkir chemical journal, No. 1 (19), p. 11- 20, Ufa, Ufa State Oil Technical University, 2012). As a result, a special type of sulfur is obtained, characterized by high plasticity. The disadvantage of this method: the fragility of the effect obtained, sulfur gradually goes into its normal state and plasticity disappears after 1-2 days.

A known method of manufacturing composite polymer reinforcement using a two-stage technology (RU 2482247 C2, IPC - E04C 5/07, publ. 20.05.2013, Bull. No. 14). At the first stage, a rope is made by weaving or twisting several bundles; at the second stage, the rope is impregnated in a bath, then pulled through a spinneret and heat-treated using pultrusion technology. The disadvantages of the method adopted for the prototype: low quality impregnation with a viscous polymer composition, there is no guarantee of the strength of the reinforcement. According to the method, rectilinear rods are produced; it is impossible to obtain curvilinear and broken-shaped elements. High energy consumption for the manufacture of fittings.

The disadvantages of the prototype are eliminated in the proposed method. The technical result of the proposed technical solution is the simplification of the manufacturing technology of composite reinforcement with a simultaneous increase in its strength characteristics and the possibility of manufacturing previously inaccessible reinforcement products of various broken shapes.

The technical result is achieved by the fact that in the method of manufacturing composite reinforcement and reinforcing products, including the formation of fiber ropes, impregnation of the ropes with a cold binder, drawing through a forming die, heat treatment up to 120-260 ° C, cooling to shop temperature and twisting the finished reinforcement into coils, according to technical solution, sulfur is used as a binder, which is extremely mobile in molten form and easily impregnates ready-made preforms and semi-finished products for the manufacture of composite reinforcement. Sulfur is pre-melted to a temperature of 130-150°C; the formed rope is pulled through a bath with a molten sulfur, squeezed out in a forming die, then abruptly cooled in a refrigerator at a temperature of 5 to 12 ° C. With a sharp cooling, the composite reinforcing rope impregnated with a sulfur binder acquires plastic properties for a while, which allows forming products of bent and / or broken shape, such as spirals, clamps, etc. After hardening, the composite reinforcing product impregnated with a sulfur binder acquires high strength properties.

In the manufacture of straight-line reinforcement that does not require plasticization and molding into broken-shaped products, it is cooled to shop temperature and twisted into coils.

For the manufacture of reinforcing products, mineral or chemical fibers are used that allow heating up to 160 ° C.

An example of the implementation of the method for obtaining a reinforcing product from a composite sulfur fiber material.

A twisted rope with a diameter of 10 mm and a length of 300-400 m made of basalt fiber, twisted or woven from five strands into a “pigtail”, is supplied wound on reels. The rope is pulled through a bath of molten sulfur with a temperature of 130-150°C. The sulfur melt has an extremely low viscosity and completely impregnates the interfiber space of the rope. Then, in the forming die, excess melt is squeezed out of the rope, and the rope is passed into a cooling chamber with water at a temperature of 5-12°C. The broach (pultrusion) speed is determined empirically, depending on the lengths of the impregnating bath and the cooling chamber, to ensure the quality of impregnation and plasticization of sulfur. After leaving the cold chamber, the rope is ready for processing into bent products, spirals, clamps, flexible connections and other reinforcing products. Reinforcement retains plasticity properties for two days, so the processes of processing into bent products should be limited in time.

Claims (2)

1. A method for the manufacture of composite reinforcing products, characterized in that a fiber rope is formed, pulled through a bath with a binder in the form of a sulfur melt with a temperature of 130-150 ° C, an excess amount of melt is squeezed out in the forming die and cooled, and in the manufacture of straight products, the rope is cooled to the workshop temperature and twisted into coils, and in the manufacture of broken-shaped products, the rope after the forming die is sharply cooled in a refrigerator with water at a temperature of 5 to 12 ° C to a plastic state and broken-shaped products are molded. 2. The method according to p. 1, characterized in that for the manufacture of reinforcing products, mineral or chemical fibers are used that allow heating up to 160 ° C.